Complete Guide to STA M12 Series Connectors

STA’s M-Series connectors include M5, M8, M9, M12, M16, M23, M40, and 7/8”, covering both panel-mount and cable-end versions. The entire series supports IP67 protection, with both threaded locking and quick-locking mechanisms.
Among them, the M12 connector series is the most widely used in industrial automation and sensing systems. This guide breaks down everything you need to know.

1. Product Specifications

① Materials

• Metal housing

• Plastic housing (ideal for salt-spray-intensive environments and cost-optimized applications)

② Pin Counts

Total of 10 pin configurations:

• 2-pin,3-pin,4-pin,4-pin D-code,5-pin B-code,6-pin,8-pin,12-pin,17-pin

• Special coding types:

  • S/T/K/L Power Codes for high-power transmission

  • X-Code / Y-Code for high-speed Ethernet data

③ Receptacle (Socket) Options

• Front-panel mount, Rear-panel mount, Right-angle (bent-pin) version

• Wiring methods: soldering or PCB termination

④ Plug Options

• Straight plug, Right-angle plug

• Field-assembly plug

  • Full-metal assembly

  • Plastic assembly

  • Wiring: crimping or soldering

  • Shielded / unshielded versions available

⑤ Electrical Ratings

• Current: 1.5A – 16A

• Voltage: 30V – 800V

2. Product Features

1. Excellent Environmental Protection

The M12 series meets IP67, ensuring performance in harsh industrial environments.
Plastic models perform well in high-salt-spray environments at lower cost.

2. Stable Electrical Transmission

Gold-plated contacts

• Salt-spray protection: 48 hours

• Maintains stable voltage and current delivery

3. Threaded Connection + Two Wiring Options

• Threaded coupling provides secure locking

• Wiring:

  • Crimp (faster, more reliable termination)

  • Solder (stable and economical)

4. Long Service Life

• ≥ 500 mating cycles

• Nickel-plated brass shells maintain long-term insertion stability

5. Wide Temperature Range

• –25°C to +85°C continuous operation

6. High-Speed Data Transmission

• X-Code (8-pin) and Y-Code (6-pin / 8-pin):
  Supports Gigabit Ethernet and industrial data demands.

7. High-Power Performance (S/T/K/L Codes)

The S/T/K/L Power Code series supports:

• Up to 16A / 800V

• Ideal for compact devices requiring high power input

3. Applications of M12 Connectors

M12 connectors are compact European-standard circular connectors widely used in:

• Industrial automation

• Sensors & transducers

• Smart manufacturing

• Robotics

• Energy storage equipment

• Marine equipment

• Motion control systems

• Industrial networking & Ethernet

Their wide pin-count range, versatile wiring methods, and high electrical performance make them one of the most universal connector types in modern industry.

FAQ Section

1. What is an M12 connector used for?

M12 connectors are used for sensors, automation equipment, robotics, Ethernet communication, and power transmission in industrial environments.

2. What do the S/T/K/L power codes mean?

They are four standardized power-coding types in the M12 system, designed to prevent mismatching and support currents up to 16A and voltages up to 800V.

3. What is the difference between X-Code and Y-Code?

• X-Code: 8-pin design for Gigabit Ethernet

• Y-Code: Power + signal hybrid or high-speed data depending on pin layout

4. Are STA M12 connectors IP67 waterproof?

Yes. All STA M12 connectors meet IP67, suitable for dust, moisture, vibration, and outdoor industrial environments.

5. Does the M12 series include both metal and plastic versions?

Yes. Metal housings provide maximum durability, while plastic housings offer cost-effective performance with higher salt-spray resistance.